Improvement in quartz-mill shoes



Unrrnn Srarns Parana? @rrron JOSEPH G. KITTREDGE, OF SAN FRANCISCO,CALIFORNIA.

IMPROVEMENT IN QUARTZ-MiLL SHCES.

Specification forming-part'of Letters Patent No. 15HA03, dated May 26,1874; application filed March 14, 1874.

Be it known that I, J osnrn G. Krrrnnnen, of San Francisco city andcounty, State of California, hai'e invented an Improved Shoe and Die forQuartzdUills; and I do hereby declare the following description issufficient to enable any person skilled in the art or science to whichit' most nearly appcrtains to make and use my said invention orimprovement without further intention or experiment.

My invention relates to improvements in the manufacture of shoes anddies for quartzniills. These shoes and dies have heretofore been made ofwrought and cast iron, and, in a few instances, wrought-iron has beenfaced with steel in order to provide a wearing-surfzfce, but the greatcost of manufaeturin g this style of shoe and die has prevented itscoming into general use. My improvement consists in manufacturing shoesand dies for quartz-mills out of cast caststeel. This metal can be castinto the required shape with great facility, and will provide, whenmanufactured, a durable and economical shoe and die.

' The character of the work to be done by shoes and (lies inquartz-mills is much different from the work of a trip-hammer or otherstyle of stamping apparatus, as the material to be crushed or hammeredis of a grinding or gritty nature, which wears away the metal of theshoes and dies Yery fast; but, by making them of cast cast-steel, asabove stated, they will be very durable, and, consequently, moreeconomical than the ordinary wrought or cast iron shoes and dies.

Having thus described my invention, what I claim, and desire to secureby Letters latent, is-

Cast cast-steel shoes and dies for quartzmills, as a new article ofmanufacture.

In witness whereof I hereunto set my hand and seal.

JOSEPH G. KITTREDGE. [L, s.]

Witnesses JNO. L. BOONE, O. M. RICHARDSON.

